Lenze Drive Server Bus server S7 getting started - Manual (Page 32)

Busserver S7
L
93 Busserver S7 DE/EN 1.0
5.6.2 Accessing several drives via OPC
The project is to be expanded to enable communication with several drives.
• Add the corresponding devices to the Hardware Manager, as described for the drive already
configured.
• Select one instance of the function block FB DRIVE (FB90) for every drive connected in the
program.
– One instance data block, one timer and one flag bit each is allocated to every instance.
– The remaining parameters are to be determined in the same way as described in the
example of communication with one drive only.
5.6.3 Accessing drives connected to PROFIBUS CPs
If an S7-300 is used, you can address drive controllers which are directly connected to the PROFIBUS
master of the CPU card and drive controllers which are connected with an external PROFIBUS
communication processor (CP).
For this, please use the block
FB DRIVE CP instead of the block FB DRIVE in the STEP7 program.
Example of a transfer parameter list:
CALL ”Lenze-DriveServer_FB”, DB100 FB91
Tag :=
PB_Address :=B#16#9
First_DriveDW :=0
DriveSend_DB :=”Lenze-DriveServer_Send” DB30
DriveRecv_DB :=”Lenze-DriveServer_Recv” DB31
DriveServer_DB :=”Lenze-DriveServer_FB” DB80
DrivePar_DB :=”S7-Parameter” DB81
TimerNr :=T1
TimeOut :=
Busy :=MB100
BE
The following transfer parameters are used in addition to the parameters listed in chapter 5.6.1
on page 91.
• The parameter FirstDriveDW defines the byte position of the first data word of the connected
drive controller.
– For each drive controller, 8 data words are reserved in the data blocks DriveSend_DB and /
or DriveRecv_DB. The first 4 data words are needed for parameter access and the last 4
data words for process data access.
– The drive controllers must have successive I/O addresses.
• DriveSend_DB is the send block for communication with the CP.
– The block consists of up to 15 variables of data type UDT91 ... UDT93. The data type to be
used depends on the number of process data words used.
– The delivery package includes DB30 with UDT93 (4 process data words).
• DriveRecv_DB is the receive block for communication with the CP.
– The block consists of up to 15 variables of data type UDT91 ... UDT93. The data type to be
used depends on the number of process data words used.
– The delivery package includes DB31 with UDT93 (4 process data words).
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